The Guide - MEM Technical Support

High Ambient Air Temperature

Eaton MEM HRC fuse links to BS 88: Part 2: 1988 operate at their stated rating in ambient air temperatures not exceeding 35°C, as required by the standard. ('Ambient air temperatures' are assumed to be temperatures within the enclosures not exceeding 15°C higher than the outside ambient). The following table indicates maximum permissible load currents applicable in high ambient situations, against nominal fuse ratings.

De-rated Currents at Various Ambients:

2A - 20A No De-rating up to and including 60°C ambient.

List No.	Max. Current at Ambient Temperature
List No.	40°C	45°C	50°C	55°C	60°C
2SA2	2	2	2	2	2
4SA2	4	4	4	4	4
6SA2	6	6	6	6	6
8SA2	8	8	8	8	8
10SA2	10	10	10	10	10
16SA2	16	16	16	16	16
20SA2	20	20	20	20	20
25SA2	25	25	25	25	25
32SA2	32	32	32	30	28
20SA2M25	20	20	20	20	20
20SA2M32	20	20	20	20	20

2SB3	2	2	2	2	2
4SB3	4	4	4	4	4
6SB3	6	6	6	6	6
8SB3	8	8	8	8	8
10SB3	10	10	10	10	10
16SB3	16	16	16	16	16
20SB3	20	20	20	20	20
25SB3	25	25	25	25	25
32SB3	32	32	31	29	27
32SB3M40	32	32	32	32	29
32SB3M50	32	32	32	32	32
32SB3M63	32	32	32	32	32

40SB4	40	40	40	39	36
50SB4	50	50	50	49	45
63SB4	63	63	63	62	58
63SB4M80	63	63	63	63	63
64SB4M100	63	63	63	63	63

80SD5	80	80	80	80	80
100SD5	100	100	100	93	86
100SD5M125	100	100	100	100	100
100SD5M160	100	100	100	100	100

80SF5	80	80	80	80	77
100SF5	100	100	100	100	92
100SF5M160	100	100	100	100	100

125SD6	125	125	125	125	125
160SD6	160	160	160	160	147
200SD6	200	200	200	185	171
200SD6M250	200	200	200	200	200

125SF6	125	125	125	125	125
160SF6	160	160	160	160	147
200SF6	200	200	200	185	171
200SF6M250	200	200	200	200	200

250SF7	250	250	244	228	210
315SF7	315	315	293	274	254
250SG7	250	250	250	250	234
315SG7	314	315	293	275	254

355SF8	355	355	338	317	293
400SF8	400	386	364	341	316
355SH8	355	355	342	320	296
400SH8	400	400	378	353	327

450SH9	450	450	450	450	431
500SH9	500	500	500	470	435
560SH9	560	560	529	495	459
630SH9	630	614	579	542	502

450SY9	450	444	419	392	363
500SY9	500	490	462	432	340
630SY9	569	540	509	476	441

710SH10	670	636	599	561	519
800SH10	741	703	663	620	574
710SY10	679	644	607	568	526
800SY10	773	733	692	647	599

16SP	16	16	16	16	16
20SP	20	20	20	20	20
25SP	25	25	25	25	25
32SP	32	32	32	32	32
40SP	40	40	40	40	40
50SP	50	50	50	50	50
63SP	63	63	61	58	53

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